Critical & general care  

Non-invasive blood pressure technology reliable during surgery

22 October 2005

Danvers, Mass, USA. Medwave has announced that a study published in Anesthesia & Analgesia shows that its Vasotrac non-invasive blood pressure monitor is a reliable alternative to cuff and direct arterial measurements during routine surgical cases.

The study (1) was conducted at Children's Hospital of Boston and concluded that, "Our data suggest that the Vasotrac system correlates closely with intra-arterial blood pressure monitoring in anesthetized children under normotensive conditions in the prone position and during pharmacologic-induced hypotension." Based on these results, it was also concluded that the Vasotrac is a reliable alternative to cuff and direct arterial blood pressure measurement during routine surgical cases.

In a previous report of children after congenital cardiac surgery, investigators at Children's Hospital of Boston had demonstrated agreement between the Vasotrac measurements and those obtained from direct intra- arterial blood pressure monitoring, but that comparison was performed once patients were in stable condition after cardiac surgery.

This newly published study was performed to test the Vasotrac under wide blood pressure fluctuations, surgical blood loss, and in a different patient position. The Vasotrac monitor was evaluated against direct intra-arterial blood pressure measurement in adolescent children during scoliosis surgery. This study provides concrete data that the Vasotrac works in challenging patient populations and is a reliable alternative to cuff and direct arterial BP measurements during routine surgical cases.

Tim O'Malley, President and CEO of Medwave, Inc., stated, "Medwave's strategy of supporting studies associated with our technology, specifically in difficult-to-monitor patient types or environments, has been very successful. We have had studies presented and published regarding the use of our technology with paediatric and obese patients, and in emergency medicine environments. All completed studies thus far have rendered positive results in which our technology has performed extremely well. Again, in this important new study that was conducted at Children's Hospital in Boston, the results are very favourable, indicating further that our sensor-based blood pressure technology is the most innovative and advanced, non-invasive method of obtaining blood pressures in a multitude of settings and across a wide spectrum of patient types."

1. Mary E. McCann, MD, David Hill, MBBS, Kristin C. Thomas, MS, RN, David Zurakowski, PhD, and Peter Laussen, MBBS. A comparison of radial artery blood pressure determination between the Vasotrac device and invasive arterial blood pressure monitoring in adolescents undergoing scoliosis surgery. Anesthesia & Analgesia: October 2005.

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